SEPTIA NINGSIH, ELA. "The use of Wordwall Media to Improve Students' Vocabulary Mastery ( Classroom Action Research At 4th Grade Students of SD N Sindang 02 Dukuhwaru District Tegal Regency Academic Year 2009 / 2010 ". Strata 1 Program. Faculty of Teacher Training and Education, Pancasakti University Tegal. Key word: Wordwall Media as learning media, students' vocabulary mastery. Unde…